Between the Google Bus protests, Tom Perkins’ bizarre letter, and the battle over Vinod Khosla’s beach, it hasn’t been a great P.R. year for Bay Area tech companies and their backers. But here’s a change of pace. Mark Zuckerberg and his wife were the most generous philanthropists of 2013. Yes, you’ve got to have a lot to give an lot, but it’s great to see a young guy like Zuck shelling out the dough. Here’s a look at the fifty most generous donors of the year.